After rolling out its password manager to a limited number of users in April, Proton has finally released the service to the general public. The tool, called Proton Pass, uses end-to-end encryption to keep your usernames and passwords away from third parties, including Proton itself. It also lets you create and store randomly generated email aliases that you can use in place of your real address.
To name more alternatives, Bitwarden is 10 € per year and you get to support an open source project.
I recommend Firefox relay for email aliases. They have a free tier, but I very much like having a subdomain, $1/month.